Shareholders' Equity - Schedule of Minimum Required Capital Amounts and Ratios for Well Capitalized Institutions and The Actual Capital Amounts and Ratios for The Company and The Bank (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Common Shareholders’ Equity	$ 1,611,611	$ 1,374,507	$ 1,286,832	$ 1,268,200
Well Capitalized Minimum Common Equity Tier One Ratio (as a percent)	6.50%	6.50%
Well Capitalized Minimum Tier 1 Capital Ratio (as a percent)	8.0	8.0
Well Capitalized Minimum Total Capital Ratio (as a percent)	10.0	10.0
Well Capitalized Minimum Tier 1 Leverage Ratio (as a percent)	5.0	5.0
Parent [Member]
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Common Shareholders’ Equity	$ 1,436,124	$ 1,374,507
Common Equity Tier One Capital	1,483,455	1,361,915
Tier 1 Capital	1,658,942	1,361,915
Total Capital	$ 1,811,943	$ 1,503,784
Common Equity Tier One Capital Ratio	12.12%	12.06%
Tier 1 Capital Ratio (as a percent)	13.56	12.06
Total Capital Ratio (as a percent)	14.81	13.31
Tier 1 Leverage Ratio (as a percent)	7.32	6.71
Subsidiaries [Member]
Minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts [Line Items]
Common Shareholders’ Equity	$ 1,586,473	$ 1,290,455
Common Equity Tier One Capital	1,645,405	1,289,435
Tier 1 Capital	1,645,405	1,289,435
Total Capital	$ 1,798,190	$ 1,431,106
Common Equity Tier One Capital Ratio	13.47%	11.43%
Tier 1 Capital Ratio (as a percent)	13.47	11.43
Total Capital Ratio (as a percent)	14.72	12.69
Tier 1 Leverage Ratio (as a percent)	7.26	6.35